Microstructure and mechanical properties of powder metallurgy Ti-6Al-3Mo-1Zr titanium alloy
A Ti-6Al-3Mo-1Zr titanium alloy with fine microstructure was prepared by powder metallurgy.The effects of different hot pressed sintering temperatures on the microstructure and mechanical properties of this alloy were studied through X-ray diffraction,scanning electron microscopy,tensile testing,and so on.The results show that Ti-6Al-3Mo-1Zr alloy prepared at a sintering temperature of 1000 ℃ exhibits fine microstructure and superior mechanical properties,and the size of prior β grain,α colony and the thickness of α lamellar are 176 μm,49 μm,and 1.49 μm,respectively.The ultimate tensile strength,yield strength and elongation at room temperature are 895 MPa,823 MPa and 12.7%,respectively.The strengthening mechanisms mainly include solid solution strengthening,Hall Petch effect and α/β interface strengthening.Due to the fact that Mo element can reduce the high temperature diffusion coefficient of titanium alloy,the size of prior β grain,α colony and the thickness of α lamellar of Ti-6Al-3Mo-1Zr alloy are smaller than those of Ti-6Al-4V alloy prepared under the same process conditions,and its strength,work hardening rate,and elongation at room temperature and high temperature are better than those of Ti-6Al-4V alloy.
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